The signal that governs the entrance to an interlocking is called what?

The signal that governs the entrance to an interlocking is referred to as a home signal. This type of signal serves a crucial role in controlling train movements as they approach an interlocking, which is a region where multiple tracks converge and where switches and signals are managed to ensure safe and efficient operations.

A home signal specifically indicates to the train whether it is safe to proceed into the interlocking or whether it must stop. It is typically positioned at a location that provides clear visibility to the engineer, ensuring they can make the necessary decisions based on the signal's indication. This function is vital for maintaining order and safety within the railway network.

In contrast, other signals such as end signals and final signals are associated with different operational contexts and do not serve the same purpose as a home signal. An entry signal, while sounding similar, is not the term used within NORAC guidelines to denote the signal at the interlocking entrance. Thus, the identification of the home signal as the governing signal for interlocking entrances is aligned with standard rail operations.